Managing Physical Units

The References of units dialog box allows you to manage physical units and their associated reference values.

From this window you may define new physical units and manage existing units. The reference value associated with a unit is used as the reference value to calculate the level in decibels (dB).

For example, if you define the unit as Pa and set the reference value to P0=2e-5 Pa, the conversion from the linear value P in Pa to the level in dB is done according to this formula:

Note: The reference value associated with the unit of the working signal is taken into account any time a physical level in dB is calculated. This includes spectral analysis, spectrogram analysis, level analysis, order analysis, and many other features of Ansys Sound: Analysis and Specification.

To Manage Physical Units:

Click File > Reference values to display the References of units dialog box.

  • Click Plus to define a new physical unit and its reference value.

  • Click the value to be removed then click Cross to remove a physical unit and its reference value.

  • Click the value to be changed then click Edit to modify a physical unit and its reference value.

The physical units management is done.